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Category:   Application (Forum/Board/Portal)  >   TWiki Vendors:   TWiki.org
(Gentoo Issues Fix) TWiki Input Validation Hole in Search Function Lets Remote Users Execute Shell Commands
SecurityTracker Alert ID:  1012318
SecurityTracker URL:  http://securitytracker.com/id/1012318
CVE Reference:   CAN-2004-1037   (Links to External Site)
Date:  Nov 24 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 20040901 and prior versions
Description:   A vulnerability was reported in TWiki. A remote user can execute shell commands on the target system.

Hans Ulrich Niedermann reported that the search function does not validate user-supplied input before executing a command line entry based on the input. A remote user can supply a specially crafted search string to execute arbitrary commands on the target system.

A demonstration exploit search string is provided:

doesnotexist1'; (uname -a; id) | sed 's/\(.*\)/__BEGIN__\1__END__.txt/'; fgrep -i -l -- 'doesnotexist2

The vendor was notified on November 12, 2004.

Impact:   A remote user can execute arbitrary shell commands on the target system with the privileges of the target web service.
Solution:   Gentoo has released a fix and indicates that all TWiki users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apps/twiki-20040902"

Vendor URL:  twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWithSearch (Links to External Site)
Cause:   Input validation error
Underlying OS:   Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 13 2004 TWiki Input Validation Hole in Search Function Lets Remote Users Execute Shell Commands



 Source Message Contents

Date:  Wed, 24 Nov 2004 10:01:35 +0100
Subject:  [gentoo-announce] [ GLSA 200411-33 ] TWiki: Arbitrary command execution


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Gentoo Linux Security Advisory                           GLSA 200411-33
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                                            http://security.gentoo.org/
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  Severity: High
     Title: TWiki: Arbitrary command execution
      Date: November 24, 2004
      Bugs: #71035
        ID: 200411-33

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Synopsis
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A bug in the TWiki search function allows an attacker to execute
arbitrary commands with the permissions of the user running TWiki.

Background
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TWiki is a Web-based groupware tool based around the concept of wiki
pages that can be edited by anybody with a Web browser.

Affected packages
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    -------------------------------------------------------------------
     Package         /   Vulnerable   /                     Unaffected
    -------------------------------------------------------------------
  1  www-apps/twiki      < 20040902                       >=3D 20040902=20

Description
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The TWiki search function, which uses a shell command executed via the
Perl backtick operator, does not properly escape shell metacharacters
in the user-provided search string.

Impact
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An attacker can insert malicious commands into a search request,
allowing the execution of arbitrary commands with the privileges of the
user running TWiki (usually the Web server user).

Workaround
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There is no known workaround at this time.

Resolution
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All TWiki users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=3Dwww-apps/twiki-20040902"

References
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  [ 1 ] TWiki Security Alert
        http://twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWit=
hSearch
  [ 2 ] CAN-2004-1037
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCAN-2004-1037

Availability
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This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200411-33.xml

Concerns?
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Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
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Copyright 2004 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0

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